For millions of women around the world, monthly periods are something that comes with real hazards, such as missing school and work or being subjected to potentially harmful sanitary conditions. But there's a global menstrual movement taking place.

Aatish Taseer talks with The World's Marco Werman about his experiences with caste in modern-day India and describes one of the most revealing moments from his new book, "The Twice Born: Life and Death on the Ganges."

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